English: Anything else?
French: Autre chose?
To ask the passenger if they would like anything else, be it something else to drink, or another snack or sandwich, or another purchase from duty-free, you can ask “autre chose?”
For extra politeness, you can also add what we've learned “désirez-vous?” literally “do you desire?” “Désirez-vous autre chose?”
-Un café, SVP.
-Voici votre café. Désirez-vous autre chose?
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